It's interesting that Amazon state, "Please note the bottle design you receive may vary from the primary image" for the Jim Beam Pre-Prohibition version, as this thread back in March has comments saying the US version is 45%/75cl, not 40%/70cl, as in the Amazon image, eg:

Joemobro4th MarThe US, 75cl version is usually 45% and the UK, 70cl is 40%. I bought this during their last offer and it was 40%. The bottle pictured above at 45% is 75cl.

The OP, SYNAESTHE5IA in the aforementioned thread said he bought his 45%/75cl bottle from Amazon near the end of January.

Scrolling
further down, it does also say 80 proof, which is 40% ABV. That
information is incorrect though. As shown in my previous "front of
bottle" photo, and the attached "side of bottle", it's 90 proof/45% ABV.
The bottle I have was purchased from Amazon on 24th Jan, and from the
link provided, as shown in the other attached photo.

A previous "Deal" when it was £17.99 (at the end of January):[ …A previous "Deal" when it was £17.99 (at the end of January):[ https://www.hotukdeals.com/deals/jim-beam-black-label-70-cl-exclusive-to-amazon-prime-1799-2885765 ]It also dropped to £17.99 again at the beginning of May, so you may wish to wait for a return to this price in the future (it that happens).

I did my best to read up on these but must have missed that one about the Black Label Amazon Special (I make a point of searching HUKD for each item I post - sometimes search terms let me down).

I had Amazon Credit and have already ordered the Pre-Prohibition version - curious to see what will arrive. The reviews on Amazon are a bit weird. Most seem to get the Pre-Prohibition bottle (and have pictures to show this) but this one's a bit worrying!